Thecarbonreleasephosphatesin the aquarium, creatingbig problems.Theanswerto this isRenew.This product is lessaggressive thancoal,making it betterforplanted aquariumsandreef.Removesorganic residues,does not alterthe pHand does not releasephosphates andat the same timehelps to controlammonia, nitratesand phosphates.Instructions for Use